If an iron (III) complex with the formula \(\left[\mathrm{Fe}\left(\mathrm{NH}_3\right)_x(\mathrm{CN})_y\right]^{-}\)has no electron in its \(e_g\) orbital, then the value of \(x+y\) is
4
5
6
3
Solution
Complex is $\begin{aligned} & x=2 \\ & y=4 \\ & \text { so } x+y=6\end{aligned}$